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Texas Instruments OPA342NA/3K
- Part No.:
- OPA342NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA342NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,034
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Product details
Overview
OPA342NA/3K from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier in SOT-23-5 package, optimized for low-power (150 µA typ), low-cost, miniature applications operating from 2.7 V to 5.5 V. It delivers 1 MHz bandwidth, 1 V/µs slew rate, and output swing within 1 mV of rails under light load - ideal for driving sampling ADCs like ADS7822 in portable data acquisition systems.
For engineers reviewing the OPA342NA/3K datasheet, OPA342NA/3K pinout, OPA342NA/3K application, or OPA342NA/3K equivalent, key selection criteria include quiescent current vs. speed trade-off, rail-to-rail dynamic range at 2.7 V supply, THD+N performance in audio buffering, and SOT-23-5 thermal resistance (200 °C/W) for space-constrained PCB layouts.
Technical Context
The OPA342NA/3K employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails, with a defined transition region near (V+) – 1.3 V where PSRR and CMRR degrade. Its class AB output stage supports rail-to-rail output swing down to 1 mV from rails into 100 kΩ loads.
It is unity-gain stable and specified over –40°C to +85°C, with input bias current as low as ±0.2 pA (typ), open-loop gain ≥104 dB (RL = 100 kΩ), and CMRR ≥76 dB at VS = 5.5 V across its full common-mode range below the transition zone.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V - enables direct interface with 3.3 V and 5 V logic, plus operation from single Li-ion cell (nominal 3.6 V). |
| Quiescent Current | 150 µA typ - allows battery-powered operation >1 year on coin cell in always-on sensor signal conditioning. |
| Gain-Bandwidth Product | 1 MHz - supports closed-loop gains up to 100 at 10 kHz while maintaining phase margin >45°. |
| Slew Rate | 1 V/µs - sufficient for 10 kHz full-scale sine wave output at 10 Vpp without distortion. |
| Input Offset Voltage | ±1 mV max (typ ±6 mV) - ensures <0.1% error in 12-bit DAC I/V conversion at 5 V full scale. |
| THD + Noise | 0.006% at 1 kHz - meets CD-quality audio line-driver requirements with minimal harmonic contamination. |
| Output Swing (vs Rail) | 1 mV into 100 kΩ - preserves >99.9% of available dynamic range in 2.7 V single-supply systems. |
Pinout & Package
SOT-23-5 surface-mount package (DBV drawing), 200 °C/W junction-to-ambient thermal resistance, RoHS-compliant, tape-and-reel packaging (3000 pcs/reel).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In (Non-inverting Input) | High-impedance CMOS input node; accepts signals from –0.3 V to (V+) + 0.3 V; requires current limiting if driven beyond rails. |
| 2 | –In (Inverting Input) | Differential input paired with Pin 1; laser-trimmed for matched offset and drift with +In in rail-to-rail input stage. |
| 3 | Out (Output) | Class AB rail-to-rail output capable of sourcing/sinking ±15 mA; settles to 0.1% in 5 µs (VS = 5.5 V, 2 V step). |
| 4 | V– (Negative Supply / Ground) | Reference return for single-supply operation; must be bypassed with 0.01 µF ceramic capacitor near pin. |
| 5 | V+ (Positive Supply) | Primary power connection; supports 2.7–5.5 V; internal ESD protection clamps to rails at ±0.5 V beyond supply. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 300 mV beyond both supply rails - enables direct sensing of 0–V+ signals without level-shifting circuitry. |
| Rail-to-rail output | Swings within 1 mV of V+ and V– into 100 kΩ - maximizes usable signal swing in low-voltage systems (e.g., 2.7 V ADC reference buffers). |
| Ultra-low quiescent current | 150 µA typical per amplifier - reduces system standby power by >5× versus standard precision op amps, critical for IoT edge nodes. |
| Single-supply optimization | Specified down to 2.7 V with full rail-to-rail performance - eliminates need for dual supplies in portable instrumentation and sensor front-ends. |
| Low THD+N | 0.006% at 1 kHz - preserves signal fidelity in audio path buffering and high-resolution data acquisition chain stages. |
Applications
| ADC Driver for Portable DAQ | Electret Microphone Preamp |
|---|---|
|
Use Scenario: Buffering and gain-setting stage before 12-bit sampling ADC (e.g., ADS7822) in handheld test equipment. IC Role / Device Role / Timing Role: Signal conditioner and charge injector mitigator; provides low-output-impedance drive to ADC sample capacitor. Use Value: 1 MHz GBW and 1 V/µs slew rate ensure settling within 5 µs for 12-bit accuracy; rail-to-rail output avoids clipping on 2.7 V supply. |
Use Scenario: First-stage amplification of electret microphone output in voice-enabled consumer devices. IC Role / Device Role / Timing Role: Low-noise, low-power transimpedance/gain stage with DC bias generation for microphone capsule. Use Value: 30 nV/√Hz input voltage noise and 0.2 pA input bias current preserve SNR; 150 µA IQ enables multi-day battery life. |
| Single-Supply Audio Line Driver | Active Filter in PCMCIA Card |
|
Use Scenario: Output buffer for DAC-based audio playback in laptop docking stations or USB DAC adapters. IC Role / Device Role / Timing Role: Rail-to-rail output stage isolating DAC from variable load impedance while preserving dynamic range. Use Value: 0.006% THD+N at 1 kHz and 1 mV rail swing enable CD-quality line-level output from 3.3 V supply without external level-shifting. |
Use Scenario: Second-order active filter in compact PCMCIA modem or data acquisition card requiring minimal board area. IC Role / Device Role / Timing Role: Gain block and frequency-selective element in low-pass/band-pass topology with precise cutoff control. Use Value: SOT-23-5 footprint saves >70% board space vs SO-8; 1 MHz GBW supports filter corner frequencies up to 100 kHz with stable phase response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6001T-I/OT | Lower quiescent current (100 µA max), but reduced GBW (1 MHz same), higher input offset (1.5 mV max), no rail-to-rail input. | Not suitable for input signals near supply rails; acceptable only when common-mode range stays >0.3 V from V– and V+. | Select MCP6001T-I/OT only if ultra-low power dominates over input range and offset precision. |
| LMV321IDBVR | Higher quiescent current (130 µA typ), rail-to-rail input/output, but lower GBW (1.4 MHz), higher THD+N (0.02%), larger SOT-23-5 footprint tolerance. | Acceptable for general-purpose buffering where 0.02% THD+N is tolerable and 1.4 MHz GBW suffices. | Choose LMV321IDBVR when cost sensitivity outweighs THD+N and offset voltage requirements. |
Compared with MCP6001T-I/OT and LMV321IDBVR, the OPA342NA/3K uniquely combines rail-to-rail input *and* output, ±1 mV offset, and 0.006% THD+N in SOT-23-5 - making it the only choice among the three for precision, low-voltage, full-swing signal conditioning where input signals approach either rail.
Availability
OPA342NA/3K is available at Aetrix Electronics and suitable for portable data acquisition, battery-powered audio interfaces, PCMCIA peripheral signal conditioning, and low-voltage sensor front-ends requiring stable component supply and consistent SOT-23-5 tape-and-reel delivery.
Supply support for OPA342NA/3K includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA342NA/3K belongs to TI's MicroAmplifier™ series, designed specifically for low-cost, low-power, miniature applications demanding rail-to-rail performance and single-supply operation in space- and energy-constrained systems.
FAQ
What is the maximum operating temperature range for the OPA342NA/3K?
The OPA342NA/3K is specified over –40°C to +85°C ambient temperature, with extended operating range up to +125°C junction temperature. Its thermal resistance (θJA = 200 °C/W in SOT-23-5) means power dissipation must remain below 12.5 mW to avoid exceeding 125°C junction under worst-case +85°C ambient conditions. The OPA342NA/3K maintains full rail-to-rail functionality across its entire specified temperature range.
Does the OPA342NA/3K support true rail-to-rail input and output simultaneously?
Yes, the OPA342NA/3K supports rail-to-rail input (common-mode range from –0.3 V to V+ + 0.3 V) and rail-to-rail output (swing within 1 mV of V+ and V– into 100 kΩ) simultaneously. However, input operation within the 400 mV transition region near (V+) – 1.3 V degrades PSRR and CMRR; the OPA342NA/3K datasheet recommends avoiding this region for precision applications.
Can the OPA342NA/3K drive capacitive loads directly?
The OPA342NA/3K can directly drive up to 250 pF of pure capacitive load in unity-gain configuration while maintaining stability. For larger capacitive loads, a 10 Ω to 20 Ω series resistor between output and load improves phase margin and reduces ringing. This resistor introduces negligible DC error if the parallel resistive load exceeds 10 kΩ, preserving accuracy in OPA342NA/3K-based ADC driver circuits.
What is the device marking for OPA342NA/3K?
The OPA342NA/3K is marked "B42" on the top surface of its SOT-23-5 package. This marking is consistent across all OPA342NA variants (including /250 and /3KG4) and appears alongside TI logo and date code. The "B42" identifier is used for traceability and matches the ordering information in TI's official package documentation.
Is the OPA342NA/3K compatible with lead-free reflow processes?
Yes, the OPA342NA/3K is RoHS-compliant and qualified for lead-free reflow with MSL Level-2 rating (260°C peak, 1-year floor life). Its NIPDAU finish and SOT-23-5 package meet JEDEC J-STD-020 standards. Reflow profile must limit time above 220°C to ≤90 seconds and peak temperature to 260°C for 10 seconds maximum to ensure long-term reliability of the OPA342NA/3K.
OPA342NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 150µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA342NA/3K FAQ
1.How can I place an order for OPA342NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA342NA/3K on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA342NA/3K reliable?
The price and inventory of OPA342NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA342NA/3K is usually 5 days.
3.What payment methods are accepted for OPA342NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA342NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA342NA/3K?
OPA342NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA342NA/3K order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA342NA/3K?
For technical support, including OPA342NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA342NA/3K requirements.
6.How does Aetrix verify that OPA342NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA342NA/3K products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA342NA/3K meets industry standards.
7.What is the process for return or replacement of OPA342NA/3K?
All OPA342NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA342NA/3K, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA342NA/3K part is unused and in its original packaging.
Return procedure for OPA342NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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